The San Jon plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.
Showers likely
Mostly cloudy
Partly cloudy
Partly cloudy
Sunny; warmer
Mostly sunny
Mostly sunny
2° on Nov. 17, 2014, the coldest reading for this week of the year since 1941. Next is 7° in 2018.
San Jon’s center stands about 4,030 ft above sea level. Within three miles the land runs from 3,980 ft to 4,090 ft, a difference of 110 ft: gently rolling country. The highest named summit within 15 miles is Park Hill, about 4,670 ft, 12 miles southeast.
Under the town center the state geologic map shows Piedmont alluvial deposits (unconsolidated), from the Pleistocene to Holocene, less than 2.6 million years old.
The section below crosses 7 rock units mapped at the surface.
Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 19×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.
Unconsolidated. Age: Pleistocene to Holocene, less than 2.6 million years old. About 8 mi of the line.
Unconsolidated. Age: Pleistocene to Holocene, less than 0.1 million years old. About 6 mi of the line.
Unconsolidated. Age: Pleistocene to Holocene, less than 0.8 million years old. About 5 mi of the line.
Unconsolidated. Age: Pleistocene, 0.1 to 2.6 million years old. About 3 mi of the line.
Sand. Age: Middle Miocene to Early Pliocene, 3.6 to 16 million years old. About 0.9 mi of the line.
Mudstone. Age: Late Triassic, 208 to 227 million years old. About 0.8 mi of the line.
From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale. 1 smaller unit along the line are not listed.
Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
A raindrop that lands in San Jon reaches the Gulf of America by way of Revuelto Creek, the Canadian, the Arkansas and the Mississippi: about 1,710 river miles.
Lakes on the way: Murray Lake and Ozark Lake.
720 miles of the trip are on the Canadian.
Traced down the USGS NHDPlus V2.1 river network from the Census center point of San Jon; river miles along the main stem, rounded.
San Jon has a cold semi-arid climate. Summer afternoons average 95° in July; winter nights fall to about 24° in January. About 13 inches of rain fall in a normal year.
On November 14 San Jon normally reaches 63° and falls to 33°. The record high is 85°, in 2025; the record low 14°, in 1976. The most rain on this date, 0.09 in, fell in 1968.
Normals 1991–2020 and records since 1941 at Tucumcari Municipal Airport, 16 miles west-northwest. NOAA, through RCC-ACIS.
